// Filename: paletteGroup.cxx
// Created by:  drose (30Nov00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////

#include "paletteGroup.h"
#include "palettePage.h"
#include "texturePlacement.h"
#include "textureImage.h"
#include "palettizer.h"
#include "paletteImage.h"

#include "indent.h"
#include "datagram.h"
#include "datagramIterator.h"
#include "bamReader.h"
#include "bamWriter.h"
#include "indirectCompareNames.h"
#include "pvector.h"

TypeHandle PaletteGroup::_type_handle;

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
PaletteGroup::
PaletteGroup() {
  _egg_count = 0;
  _dependency_level = 0;
  _dependency_order = 0;
  _dirname_order = 0;
  _has_margin_override = false;
  _margin_override = 0;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::set_dirname
//       Access: Public
//  Description: Sets the directory name associated with the palette
//               group.  This is an optional feature that can be used
//               to place the maps for the different palette groups
//               into different install directories.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
set_dirname(const string &dirname) {
  _dirname = dirname;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::has_dirname
//       Access: Public
//  Description: Returns true if the directory name has been
//               explicitly set for this group.  If it has not,
//               get_dirname() returns an empty string.
////////////////////////////////////////////////////////////////////
bool PaletteGroup::
has_dirname() const {
  return !_dirname.empty();
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_dirname
//       Access: Public
//  Description: Returns the directory name associated with the
//               palette group.  See set_dirname().
////////////////////////////////////////////////////////////////////
const string &PaletteGroup::
get_dirname() const {
  return _dirname;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::clear_depends
//       Access: Public
//  Description: Eliminates all the dependency information for this
//               group.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
clear_depends() {
  _dependent.clear();
  _dependency_level = 0;
  _dependency_order = 0;
  _dirname_order = 0;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::group_with
//       Access: Public
//  Description: Indicates a dependency of this group on some other
//               group.  This means that the textures assigned to this
//               group may be considered successfully assigned if they
//               are actually placed in the other group.  In practice,
//               this means that the textures associated with the
//               other palette group will always be resident at
//               runtime when textures from this palette group are
//               required.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
group_with(PaletteGroup *other) {
  _dependent.insert(other);
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_groups
//       Access: Public
//  Description: Returns the set of groups this group depends on.
////////////////////////////////////////////////////////////////////
const PaletteGroups &PaletteGroup::
get_groups() const {
  return _dependent;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_margin_override
//       Access: Public
//  Description: Returns the set of groups this group depends on.
////////////////////////////////////////////////////////////////////
int PaletteGroup::
get_margin_override() const {
  return _margin_override;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_margin_override
//       Access: Public
//  Description: Returns the set of groups this group depends on.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
set_margin_override(const int override) {
  _margin_override = override;
  _has_margin_override = true;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::has_margin_override
//       Access: Public
//  Description: Returns the set of groups this group depends on.
////////////////////////////////////////////////////////////////////
bool PaletteGroup::
has_margin_override() const {
  return _has_margin_override;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_placements
//       Access: Public
//  Description: Adds the set of TexturePlacements associated with
//               this group to the indicated vector.  The vector is
//               not cleared before this operation; if the user wants
//               to retrieve the set of placements particular to this
//               group only, it is the user's responsibility to clear
//               the vector first.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
get_placements(pvector<TexturePlacement *> &placements) const {
  Placements::const_iterator pi;
  for (pi = _placements.begin(); pi != _placements.end(); ++pi) {
    placements.push_back(*pi);
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_complete_placements
//       Access: Public
//  Description: Adds the set of TexturePlacements associated with
//               this group and all dependent groups to the indicated
//               vector.  See get_placements().
////////////////////////////////////////////////////////////////////
void PaletteGroup::
get_complete_placements(pvector<TexturePlacement *> &placements) const {
  PaletteGroups complete;
  complete.make_complete(_dependent);

  PaletteGroups::iterator gi;
  for (gi = complete.begin(); gi != complete.end(); ++gi) {
    PaletteGroup *group = (*gi);
    group->get_placements(placements);
  }

  get_placements(placements);
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::reset_dependency_level
//       Access: Public
//  Description: Unconditionally sets the dependency level and order
//               of this group to zero, in preparation for a later
//               call to set_dependency_level().  See
//               set_dependency_level().
////////////////////////////////////////////////////////////////////
void PaletteGroup::
reset_dependency_level() {
  _dependency_level = 0;
  _dependency_order = 0;
  _dirname_order = 0;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::set_dependency_level
//       Access: Public
//  Description: Sets the dependency level of this group to the
//               indicated level, provided that level is not lower
//               than the level that was set previously.  Also
//               cascades to all dependent groups.  See
//               get_dependency_level().
//
//               This call recurses to correctly set the dependency
//               level of all PaletteGroups in the hierarchy.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
set_dependency_level(int level) {
  if (level > _dependency_level) {
    _dependency_level = level;
    PaletteGroups::iterator gi;
    for (gi = _dependent.begin(); gi != _dependent.end(); ++gi) {
      PaletteGroup *group = (*gi);
      group->set_dependency_level(level + 1);
    }
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::set_dependency_order
//       Access: Public
//  Description: Updates the dependency order of this group.  This
//               number is the inverse of the dependency level, and
//               can be used to rank the groups in order so that all
//               the groups that a given group depends on will appear
//               first in the list.  See get_dependency_order().
//
//               This function returns true if anything was changed,
//               false otherwise.
////////////////////////////////////////////////////////////////////
bool PaletteGroup::
set_dependency_order() {
  bool any_changed = false;

  PaletteGroups::iterator gi;
  for (gi = _dependent.begin(); gi != _dependent.end(); ++gi) {
    PaletteGroup *group = (*gi);
    if (group->set_dependency_order()) {
      any_changed = true;
    }

    if (_dependency_order <= group->get_dependency_order()) {
      _dependency_order = group->get_dependency_order() + 1;
      any_changed = true;
    }

    if (_dirname == group->get_dirname()) {
      // The dirname orders should be equal.
      if (_dirname_order < group->get_dirname_order()) {
        _dirname_order = group->get_dirname_order();
        any_changed = true;
      }
    } else {
      // The dirname orders should be different.
      if (_dirname_order <= group->get_dirname_order()) {
        _dirname_order = group->get_dirname_order() + 1;
        any_changed = true;
      }
    }
  }

  return any_changed;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_dependency_level
//       Access: Public
//  Description: Returns the dependency level of this group.  This is
//               a measure of how specific the group is; the lower the
//               dependency level, the more specific the group.
//
//               Groups depend on other groups in a hierarchical
//               relationship.  In general, if group a depends on
//               group b, then b->get_dependency_level() >
//               a->get_dependency_level().
//
//               Thus, groups that lots of other groups depend on have
//               a higher dependency level; groups that no one else
//               depends on have a low dependency level.  This is
//               important when deciding which groups are best suited
//               for assigning a texture to; in general, the texture
//               should be assigned to the most specific suitable
//               group (i.e. the one with the lowest dependency
//               level).
////////////////////////////////////////////////////////////////////
int PaletteGroup::
get_dependency_level() const {
  return _dependency_level;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_dependency_order
//       Access: Public
//  Description: Returns the dependency order of this group.  This is
//               similar in principle to the dependency level, but it
//               represents the inverse concept: if group a depends on
//               group b, then a->get_dependency_order() >
//               b->get_dependency_order().
//
//               This is not exactly the same thing as n -
//               get_dependency_level().  In particular, this can be
//               used to sort the groups into an ordering such that
//               all the groups that group a depends on appear before
//               group a in the list.
////////////////////////////////////////////////////////////////////
int PaletteGroup::
get_dependency_order() const {
  return _dependency_order;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_dirname_order
//       Access: Public
//  Description: Returns the dependency order of this group.  This is
//               similar in principle to the dependency level, but it
//               represents the inverse concept: if group a depends on
//               group b, then a->get_dirname_order() >
//               b->get_dirname_order().
//
//               This is not exactly the same thing as n -
//               get_dependency_level().  In particular, this can be
//               used to sort the groups into an ordering such that
//               all the groups that group a depends on appear before
//               group a in the list.
////////////////////////////////////////////////////////////////////
int PaletteGroup::
get_dirname_order() const {
  return _dirname_order;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::is_preferred_over
//       Access: Public
//  Description: Returns true if this group should be preferred for
//               adding textures over the other group, if both are
//               available.  In other words, this is a more specific
//               group than the other one.
////////////////////////////////////////////////////////////////////
bool PaletteGroup::
is_preferred_over(const PaletteGroup &other) const {
  if (get_dirname_order() != other.get_dirname_order()) {
    return (get_dirname_order() > other.get_dirname_order());

  } else if (get_dependency_order() != other.get_dependency_order()) {
    return (get_dependency_order() > other.get_dependency_order());

  } else {
    return (get_egg_count() < other.get_egg_count());
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::increment_egg_count
//       Access: Public
//  Description: Increments by one the number of egg files that are
//               known to reference this PaletteGroup.  This is
//               designed to aid the heuristics in texture placing;
//               it's useful to know how many different egg files are
//               sharing a particular PaletteGroup.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
increment_egg_count() {
  _egg_count++;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_egg_count
//       Access: Public
//  Description: Returns the number of egg files that share this
//               PaletteGroup.
////////////////////////////////////////////////////////////////////
int PaletteGroup::
get_egg_count() const {
  return _egg_count;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::get_page
//       Access: Public
//  Description: Returns the page associated with the indicated
//               properties.  If no page object has yet been created,
//               creates one.
////////////////////////////////////////////////////////////////////
PalettePage *PaletteGroup::
get_page(const TextureProperties &properties) {
  Pages::iterator pi = _pages.find(properties);
  if (pi != _pages.end()) {
    return (*pi).second;
  }

  PalettePage *page = new PalettePage(this, properties);
  bool inserted = _pages.insert(Pages::value_type(properties, page)).second;
  nassertr(inserted, page);
  return page;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::prepare
//       Access: Public
//  Description: Marks the indicated Texture as ready for placing
//               somewhere within this group, and returns a
//               placeholder TexturePlacement object.  The texture is
//               not placed immediately, but may be placed later when
//               place_all() is called; at this time, the
//               TexturePlacement fields will be filled in as
//               appropriate.
////////////////////////////////////////////////////////////////////
TexturePlacement *PaletteGroup::
prepare(TextureImage *texture) {
  TexturePlacement *placement = new TexturePlacement(texture, this);
  _placements.insert(placement);

  // [gjeon] update swapTexture information
  TextureSwapInfo::iterator tsi = _textureSwapInfo.find(texture->get_name());
  if (tsi != _textureSwapInfo.end()) {
    vector_string swapTextures = (*tsi).second;

    vector_string::const_iterator wi;
    wi = swapTextures.begin();
    ++wi;
    ++wi;

    // [gjeon] since swapped texture usually didn't mapped to any egg file
    // we need to create soucreTextureImage by using original texture file's info
    const string originalTextureName = (*wi);
    TextureImage *originalTexture = pal->get_texture(originalTextureName);
    SourceTextureImage *source = originalTexture->get_preferred_source();
    const Filename originalTextureFilename = source->get_filename();
    const Filename originalTextureAlphaFilename = source->get_alpha_filename();
    int originalTextureAlphaFileChannel = source->get_alpha_file_channel();

    ++wi;
    while (wi != swapTextures.end()) {
      const string &swapTextureName = (*wi);
      TextureImage *swapTextureImage = pal->get_texture(swapTextureName);
      Filename swapTextureFilename = Filename(originalTextureFilename.get_dirname(), swapTextureName + "." + originalTextureFilename.get_extension());
      swapTextureImage->get_source(swapTextureFilename, originalTextureAlphaFilename, originalTextureAlphaFileChannel);
      placement->_textureSwaps.push_back(swapTextureImage);
      ++wi;
    }
  }  

  return placement;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::unplace
//       Access: Public
//  Description: Removes the texture from its position on a
//               PaletteImage, if it has been so placed.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
unplace(TexturePlacement *placement) {
  nassertv(placement->get_group() == this);

  Placements::iterator pi;
  pi = _placements.find(placement);
  if (pi != _placements.end()) {
    _placements.erase(pi);

    if (placement->is_placed()) {
      placement->get_page()->unplace(placement);
    }
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::place_all
//       Access: Public
//  Description: Once all the textures have been assigned to this
//               group, try to place them all onto suitable
//               PaletteImages.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
place_all() {
  // First, go through our prepared textures and assign each unplaced
  // one to an appropriate page.
  Placements::iterator pli;
  for (pli = _placements.begin(); pli != _placements.end(); ++pli) {
    TexturePlacement *placement = (*pli);
      
    if (placement->get_omit_reason() == OR_working) {
      PalettePage *page = get_page(placement->get_properties());
      page->assign(placement);
    }
  }

  // Then, go through the pages and actually do the placing.
  Pages::iterator pai;
  for (pai = _pages.begin(); pai != _pages.end(); ++pai) {
    PalettePage *page = (*pai).second;
    page->place_all();
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::update_unknown_textures
//       Access: Public
//  Description: Checks for new information on any textures within the
//               group for which some of the saved information is
//               incomplete.  This may be necessary before we can
//               properly place all of the textures.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
update_unknown_textures(const TxaFile &txa_file) {
  Placements::iterator pli;
  for (pli = _placements.begin(); pli != _placements.end(); ++pli) {
    TexturePlacement *placement = (*pli);

    if (!placement->is_size_known()) {
      // This texture's size isn't known; we have to determine its
      // size.
      TextureImage *texture = placement->get_texture();
      if (!texture->got_txa_file()) {
        // But first, we need to look up the texture in the .txa file.
        texture->pre_txa_file();
        txa_file.match_texture(texture);
        texture->post_txa_file();
      }

      placement->determine_size();
    }
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::write_image_info
//       Access: Public
//  Description: Writes a list of the PaletteImages associated with
//               this group, and all of their textures, to the
//               indicated output stream.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
write_image_info(ostream &out, int indent_level) const {
  Pages::const_iterator pai;
  for (pai = _pages.begin(); pai != _pages.end(); ++pai) {
    PalettePage *page = (*pai).second;
    page->write_image_info(out, indent_level);
  }

  // Write out all the unplaced textures, in alphabetical order by name.
  pvector<TexturePlacement *> placement_vector;
  placement_vector.reserve(_placements.size());
  Placements::const_iterator pli;
  for (pli = _placements.begin(); pli != _placements.end(); ++pli) {
    TexturePlacement *placement = (*pli);
    if (placement->get_omit_reason() != OR_none) {
      placement_vector.push_back(placement);
    }
  }
  sort(placement_vector.begin(), placement_vector.end(),
       IndirectCompareNames<TexturePlacement>());

  pvector<TexturePlacement *>::const_iterator pvi;
  for (pvi = placement_vector.begin(); 
       pvi != placement_vector.end();
       ++pvi) {
    TexturePlacement *placement = (*pvi);

    indent(out, indent_level)
      << placement->get_texture()->get_name()
      << " unplaced because ";
    switch (placement->get_omit_reason()) {
    case OR_coverage:
      out << "coverage (" << placement->get_uv_area() << ")";
      break;
      
    case OR_size:
      out << "size (" << placement->get_x_size() << " "
          << placement->get_y_size() << ")";
      break;
      
    default:
      out << placement->get_omit_reason();
    }
    out << "\n";
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::optimal_resize
//       Access: Public
//  Description: Attempts to resize each PalettteImage down to its
//               smallest possible size.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
optimal_resize() {
  Pages::iterator pai;
  for (pai = _pages.begin(); pai != _pages.end(); ++pai) {
    PalettePage *page = (*pai).second;
    page->optimal_resize();
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::reset_images
//       Access: Public
//  Description: Throws away all of the current PaletteImages, so that
//               new ones may be created (and the packing made more
//               optimal).
////////////////////////////////////////////////////////////////////
void PaletteGroup::
reset_images() {
  Pages::iterator pai;
  for (pai = _pages.begin(); pai != _pages.end(); ++pai) {
    PalettePage *page = (*pai).second;
    page->reset_images();
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::setup_shadow_images
//       Access: Public
//  Description: Ensures that each PaletteImage's _shadow_image has
//               the correct filename and image types, based on what
//               was supplied on the command line and in the .txa
//               file.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
setup_shadow_images() {
  Pages::iterator pai;
  for (pai = _pages.begin(); pai != _pages.end(); ++pai) {
    PalettePage *page = (*pai).second;
    page->setup_shadow_images();
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::update_images
//       Access: Public
//  Description: Regenerates each PaletteImage on this group that needs
//               it.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
update_images(bool redo_all) {
  Pages::iterator pai;
  for (pai = _pages.begin(); pai != _pages.end(); ++pai) {
    PalettePage *page = (*pai).second;
    page->update_images(redo_all);
  }
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::register_with_read_factory
//       Access: Public, Static
//  Description: Registers the current object as something that can be
//               read from a Bam file.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
register_with_read_factory() {
  BamReader::get_factory()->
    register_factory(get_class_type(), make_PaletteGroup);
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::write_datagram
//       Access: Public, Virtual
//  Description: Fills the indicated datagram up with a binary
//               representation of the current object, in preparation
//               for writing to a Bam file.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
write_datagram(BamWriter *writer, Datagram &datagram) {
  TypedWritable::write_datagram(writer, datagram);
  datagram.add_string(get_name());
  datagram.add_string(_dirname);
  _dependent.write_datagram(writer, datagram);

  datagram.add_int32(_dependency_level);
  datagram.add_int32(_dependency_order);
  datagram.add_int32(_dirname_order);

  datagram.add_uint32(_placements.size());
  Placements::const_iterator pli;
  for (pli = _placements.begin(); pli != _placements.end(); ++pli) {
    writer->write_pointer(datagram, (*pli));
  }

  datagram.add_uint32(_pages.size());
  Pages::const_iterator pai;
  for (pai = _pages.begin(); pai != _pages.end(); ++pai) {
    writer->write_pointer(datagram, (*pai).second);
  }
  datagram.add_bool(_has_margin_override);
  datagram.add_int16(_margin_override);

}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::complete_pointers
//       Access: Public, Virtual
//  Description: Called after the object is otherwise completely read
//               from a Bam file, this function's job is to store the
//               pointers that were retrieved from the Bam file for
//               each pointer object written.  The return value is the
//               number of pointers processed from the list.
////////////////////////////////////////////////////////////////////
int PaletteGroup::
complete_pointers(TypedWritable **p_list, BamReader *manager) {
  int pi = TypedWritable::complete_pointers(p_list, manager);

  pi += _dependent.complete_pointers(p_list + pi, manager);

  int i;
  for (i = 0; i < _num_placements; i++) {
    TexturePlacement *placement;
    DCAST_INTO_R(placement, p_list[pi++], pi);
    bool inserted = _placements.insert(placement).second;
    nassertr(inserted, pi);
  }

  // We must store the list of pages in a temporary vector first.  We
  // can't put them directly into the map because the map requires
  // that all the pointers in the page's get_properties() member have
  // been filled in, which may not have happened yet.
  _load_pages.reserve(_num_pages);
  for (i = 0; i < _num_pages; i++) {
    PalettePage *page;
    DCAST_INTO_R(page, p_list[pi++], pi);
    _load_pages.push_back(page);
  }

  return pi;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::finalize
//       Access: Public, Virtual
//  Description: This method is called by the BamReader after all
//               pointers everywhere in the world have been completely
//               read in.  It's a hook at which the object can do
//               whatever final setup it requires that depends on
//               other pointers being valid.
////////////////////////////////////////////////////////////////////
void PaletteGroup::
finalize(BamReader *) {
  // Now we can copy the pages into the actual map.
  pvector<PalettePage *>::const_iterator pi;
  for (pi = _load_pages.begin(); pi != _load_pages.end(); ++pi) {
    PalettePage *page = (*pi);
    bool inserted = _pages.
      insert(Pages::value_type(page->get_properties(), page)).second;
    nassertv(inserted);
  }

  _load_pages.clear();
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::make_PaletteGroup
//       Access: Protected, Static
//  Description: This method is called by the BamReader when an object
//               of this type is encountered in a Bam file; it should
//               allocate and return a new object with all the data
//               read.
////////////////////////////////////////////////////////////////////
TypedWritable *PaletteGroup::
make_PaletteGroup(const FactoryParams &params) {
  PaletteGroup *me = new PaletteGroup;
  DatagramIterator scan;
  BamReader *manager;

  parse_params(params, scan, manager);
  me->fillin(scan, manager);
  manager->register_finalize(me);
  return me;
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::fillin
//       Access: Protected
//  Description: Reads the binary data from the given datagram
//               iterator, which was written by a previous call to
//               write_datagram().
////////////////////////////////////////////////////////////////////
void PaletteGroup::
fillin(DatagramIterator &scan, BamReader *manager) {
  TypedWritable::fillin(scan, manager);
  set_name(scan.get_string());
  _dirname = scan.get_string();
  _dependent.fillin(scan, manager);

  _dependency_level = scan.get_int32();
  _dependency_order = scan.get_int32();
  _dirname_order = scan.get_int32();

  _num_placements = scan.get_uint32();
  manager->read_pointers(scan, _num_placements);

  _num_pages = scan.get_uint32();
  manager->read_pointers(scan, _num_pages);

  if(Palettizer::_read_pi_version >= 19) {    
    _has_margin_override = scan.get_bool();
    _margin_override = scan.get_int16();
  } 
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::add_texture_swap_info
//       Access: Public
//  Description: Store textureswap information from textures.txa
////////////////////////////////////////////////////////////////////
void PaletteGroup::
add_texture_swap_info(const string sourceTextureName, const vector_string &swapTextures) {
  TextureSwapInfo::iterator tsi = _textureSwapInfo.find(sourceTextureName);
  if (tsi != _textureSwapInfo.end()) {
    _textureSwapInfo.erase(tsi);
  }
  _textureSwapInfo.insert(TextureSwapInfo::value_type(sourceTextureName, swapTextures));
}

////////////////////////////////////////////////////////////////////
//     Function: PaletteGroup::is_none_texture_swap
//       Access: Public
//  Description: Returns textureswap information is set or not,
//               True if it's not set.
////////////////////////////////////////////////////////////////////
bool PaletteGroup::
is_none_texture_swap() const {
  return _textureSwapInfo.empty();
}
